Properties of the Number 81931

Eighty-One Thousand Nine Hundred Thirty-One

Basics

Value: 81930 → 81931 → 81932

Parity: odd

Prime: Yes

Previous Prime: 81929

Next Prime: 81937

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 81931

Divisors: 1, 81931

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10100000000001011

Octal: 240013

Duodecimal: 3B4B7

Hexadecimal: 1400b

Square: 6712688761

Square Root: 286.2359166841226

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Primes which yield a prime whenever a 1 is inserted anywhere in them (including at the beginning or end). A69246

Lexicographically earliest permutation of the primes such that successive absolute differences yield a permutation of all nonprime numbers. A203985

Smallest k such that (10ⁿ+k, 10ⁿ+k+2) and (10ⁿ⁺¹+k, 10ⁿ⁺¹+k+2) are two pairs of twin primes with k(n+1) > k(n). A224846

Numbers that are both prime-indexed primes and lucky-indexed lucky numbers. A307008

Primes p such that (p reversed) +6 is a square. A167472

Primes in A002049. A185846

Number of discordant permutations. A565

Diagonal of triangle in A081930. A81931